* {
  margin: 0;
  padding: 0;
}
.banner {
  width: 100%;
  margin-top: 100px;
  background-color: #121212;
}
.main-img {
  width: 100%;
  height: 550px;
  position: relative;
}
.main-img img {
  width: 80%;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.center-img {
  width: 4%;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.banner-txt {
  z-index: 1;
  font-size: 20px;
  line-height: 100px;
  color: white;
  height: 100px;
  background-color: rgba(0, 0, 0, 0.5);
  text-align: center;
  width: 100%;
  position: absolute;
  left: 50%;
  top: 100%;
  transform: translate(-50%, -100px);
}
.container {
  margin-top: 20px;
}
.container-text {
  width: 100%;
  font-size: 18px;
  text-align: center;
  color: #b4b4b4;
  padding: 5% 0;
}
.img-responsive {
  position: relative;
  width: 100%;
  text-align: center;
  background-color: #121212;
}
.zhongxin-img {
  width: 5%;
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  margin: 25% 50%;
}
.center {
  width: 5%;
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  bottom: 0;
  margin: 25% 50%;
  display: none;
}
#img1 {
  width: 29px;
}
